Hi Aja,
It's a tricky situation when a guest raises a concern but doesn't want immediate action. In this case, it sounds like the guest is trying to gauge the severity before deciding if it really impacts their stay. You’ve already offered a reasonable solution by suggesting that someone could speak to the neighbor, which was the right approach.
It might be helpful to just document the complaint in case it escalates. You can gently check in with the guest the next day to see if the barking became an issue overnight. Offering something like earplugs or a white noise machine could be a thoughtful gesture without overstepping. If it does become more disruptive, you can address it with the neighbor, but for now, it seems like the guest is willing to wait and see.
Taking proactive but non-intrusive steps can sometimes help guests feel supported, even if they aren't sure they want action yet.
I hope this helps.
All the best,
Upfish Management